Sound-box.



1. s. osTaoM.

SOUND BOX. APPLICATION FILED my. 30, 1914.

s: Patented Jan.4, 1916.

INVENTOR. QsT/iofif AJTTORNEYSQ WITNESSES unrrnn s'rarns PArnnrorfnrenl JOHNS. osrnom, or sANr-RANcIsco, oanir'onnraif a, SOUND-BOX.

Specification of Letters Patent.

sound reproducing or recording machines.

' An object of the invention is to provide a sound box which will cause a clear and correct reproduction of the sound.

Another object of the invention is to pro vide a sound box in which the vibrations are unhampered in their travel between the stylus and diaphragm.

The invention possesses other advantageous features, some of whlch. with the foregoing, will be set forth at length in the fol-.

lowing description, where I shall outline in full that form of the invention which I have selected for illustrationin the drawings accompanying and forming part of the present specification.

In the drawings I haveshow'n only one specific form of my generic invention, but it is tobe understood thatI do not limit myself to such form because my invention/may be embodied in a multiplicity of forms, each being a species of my said invention.

It is also to be understood that by the claims succeeding the description of my invention', I desire to'cover the invention in whatever form it may be embodied.

' Referring to said drawings: Figure 1. is a side view of the sound box of my invention mounted on the sound conducting arm, the sound box being shown with the stylus at right angles to the arm for purposes of con-' venience. Fig. 2 is an underneath .view of the soundbox and arm taken 1n the position shown in Fig. 1. Fig. 3 1s a cross section' of the sound box taken on the line A-A Fig. 1. 4: is a cross section of thesound box taken on the line BB Fig. 1.

' The sound boxof my invention comprises the casing 2 in which the diaphragm 3 is 211'- ranged in any suitable manner. The casing means, such as the screws 5. J The sound box is securely attached to the-horn or sound conducting armor or tube 4, by any suitable i usually arranged so that. the needle or stylus 6 lies at an acute angle to the adjacent surface of the sound record, but in the drawings, for the purpose of convenience,

-flat spirals 13-14,-which act as springsto sectional dimension in a plane at right'anends by pins or screws 15, which engage the the needle is disposed lo-that itliesjat right angle-to the. surfaceof therecord.

Secured tothe casingu2 and preferably element to which. the stylus bar and stylus holder. are attached comprises a flatbar formed at its opposite endsin the shape of produce the-resiliency of the element. The Q bar forming the spirals has its greater cross I sectional dimension in a plane parallel to the plane of the diaphragm and its smaller cross files to the plane .of the'diaplir'agm, and the at spirals lie substantially in a planeparal lel to the plane ofthe diaphragm, so that the portion of the bar intermediate the spirals'is free to vibrate any direction, butmore partlcularly in a plane atright angles to the plane of the diaphragm. Therefore, thewibrations produced-by the record on the stylus are conveyed to the diaphragm without any damping effect.

The spring bar 8 is mounted on the plate '7 in such manner that it is free to vibrate under the influence of the impulses of the sound record. The bar is supported at its opposite bar at the centers of the spirals. The pins 15 are preferably screwed into the plate '7, and at their outer ends fit snugly into holes at the centers of the spirals. These pins serve the purpose of carrying or supporting the resilient bar. ,Thebar is pressed onto the pins 15 by means of the screws 16 ar' ranged at opposite sides of the center of the bar. These screws 16 pass through clearance holes in the bar so that the bar may vibrate, and engagethe plate 7. The screws 1 6 and the pins 15' are alined and lie in a plane at right angles to the stylus bar 9, so that the stylus bar is in effect resiliently pivoted -at the line drawn through the pins and screws, thereby allowing the stylus bar to vibrate freely as a whole under the influence of the impulses of the record. The impulses or markings of the record are usually at right angles to the plane of the diaphragm and by 11 PatentedJanQ 4, i9 6. I;

' ing screws or both. The stylus bar is firmly but resiliently supported and is resiliently mounted between the needle and the connection with the diaphragm, so that all of the vibrations of the record are conducted directly to the diaphragm.

'I claim:

.1. In .a sound box, a casing, a diaphragm arranged in said casing,a stylus bar attached to said diaphragm, a bar to which said stylus bar is attached, said last named bar being provided at its ends with flat spiral portions, and means for supporting said last named .bar at its ends.

2. In a sound box, a casing, a diaphragm arranged in said casing, a stylus bar attached to said diaphragm, and a flat bar having flat spiral ends supported at its ends on said casing and to which said stylus bar is attached, the stylus bar lying at a right angle to a line through the points of support of the flat bar.

3. In a sound box, a casing, a diaphragm arranged in said casing, a stylus bar attached to said diaphragm, a flat bar having fiat spiral ends to which the stylus bar is attached intermediate said spiral ends, pins engaging the casing and the center of said spirals, and screws passing through the flat bar intermediate the spirals and engaging the casing adapted to press the bar firmly against the pins. 1

4. In a sound box, a stylus bar, astylus bar mounting comprising a fiat bar having spiral ends, means for supporting the flat bar at its ends, and means arranged inter mediate the ends for pressing the bar against said supporting means, the pressing means and the supporting means being alined and being disposed in a plane at right angles to the stylus bar.

5. In a sound box, a stylus bar, a fiat bar havingflat spiral. ends to which the stylus bar is attached intermediate said ends, supporting pins engaging the center of the said spiral ends and tension screws passing through the flat bar intermediate the spirals, said supporting pins and tension screws being in alinement.

i 6. In a sound box, a stylus bar, and a supporting bar for said stylus bar terminating in flat spiral portions.

. 7. In a sound box, a stylus bar, and a flat bar having spiral ends to which said stylus bar is attached, said flat bar being supported at the center of said spiral ends.

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 25th day of November, 1914.

JOHN S. OSTR-OM.

In presence of- H. G. PROST, M. LE Comm. 

